public class Example4_10 {
  public static void main(String args[]) {
    Lader.下底 = 100;
    Lader laderOne = new Lader();
    Lader laderTwo = new Lader();
    laderOne.设置上底(28);
    laderTwo.设置上底(66);
    System.out.println("laderOne的上底:"+laderOne.获取上底());
    System.out.println("laderOne的下底:"+laderOne.获取下底());
    System.out.println("laderTwo的上底:"+laderTwo.获取上底());
    System.out.println("laderTwo的下底:"+laderTwo.获取下底());
  }
}

